The story follows Mimi, a spirited girl whose return from camp launches a school-year of everyday adventures at a boarding school: friendships, good-natured mischief, holidays, athletic contests, a horse show, and theatrical and social events. Episodes trace family moments, a teacher's wedding, secret schemes, an accident and its aftermath, a mystery about an identity called Chloe, and the routines of dorm life. Scenes emphasize camaraderie, loyalty, small domestic pleasures, and the ups and downs of adolescent growth, presented in short episodic chapters combining humor, sentiment, and gentle moral lessons.